. >> a law enforcement source tells cbs news the train operator told first responders he applied the brakes but they did not function. cbs news, the bronx, new york. >>> and in new mexico experts still don't know why a freight train left the tracks and tumbled down a refeen. three train operators were killed in this accident. nobody else was on board. >>> it is the end of a long holiday weekend. so, we wanted to take a look at travel conditions around the bay as people make their way home. this is a look at the bay bridge toll phaza. traffic is height. now on to 680, traffic there is heavy. it is moving slowly. to give you an idea, the westbound traffic is coming towards us. it might get slower. and a look at 880. a lot of cars there. things appear to be moving right along. >> the post thanksgiving airport chaos is in full swing tonight in all three bay area airports. don knapp is at sfo where it is busier than ever. one local airport saw a decline in recent years, don? >> yes. >> by all appearances it is doing a great business here at sfo. a bit of a madhouse. what happens on holida